Previous names

  • Sajo
  • Happy Lass
  • 1935 Spero
Certificate no 1964
Status Registered


Function Leisure Craft
Subfunction Yacht
Location Thames Ditton
Vessel type Motor Yacht
Current use Private use
Available to hire No
Available for excursions No
Info required No


Builder Silver, James A Ltd, Rosneath
Built in 1935
Hull material
Rig Schooner
Number of decks 1
Number of masts 2
Propulsion Motor
Number of engines 1
Primary engine type Diesel
Boiler type None
Boilermaker None


Breadth: Beam
12.00 feet (3.66 m)
5.00 feet (1.53 m)
Length: Overall
56.00 feet (17.08 m)
Tonnage: Gross
Air Draft
To be confirmed



This classic single screw motor yacht was built by James A. Silver Ltd, at Rosneath, for the prominent Clyde engineer, Mr. C Shanks. She was the sixth example of the new Brown Owl Class and was designed in close collaboration with the commissioning owner. She boasted a single engine installation, rare for this type of craft, with innovative vibration, absorption and possibly the first marine use of a calorifier.

Key dates

  • 7/6/1940

    Requisitioned by Admiralty as auxiliary patrol vessel

  • 7/1941

    Defensive equipment of Merchant Ships (DEMS) service 

  • 15/6/1942

    Compulsorily purchased by MOWT (still DEMS service)

  • 7/1946

    returned by sale to previous owner

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